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From "Stefan Egli (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (OAK-1368) Only one Observer per session
Date Thu, 03 Nov 2016 16:06:59 GMT

     [ https://issues.apache.org/jira/browse/OAK-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Stefan Egli resolved OAK-1368.
    Resolution: Won't Fix

> Only one Observer per session
> -----------------------------
>                 Key: OAK-1368
>                 URL: https://issues.apache.org/jira/browse/OAK-1368
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: jcr
>            Reporter: Jukka Zitting
>            Assignee: Michael Dürig
>              Labels: observation
> As mentioned in OAK-1332, a case where a single session registers multiple observation
listeners can be troublesome if events are delivered concurrently to all of those listeners,
since in such a case the {{NamePathMapper}} and other session internals will likely suffer
from lock contention.
> A good way to avoid this would be to have all the listeners registered within a single
session be tied to a single {{Observer}} and thus processed sequentially.
> Doing so would also improve performance as the listeners could leverage the same content
diff. As the listeners come from a single session and thus presumably from a single client,
there's no need to worry about one client blocking the work of another.

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